Product Overview
The Yokogawa ALR121‑S50 S1 is a serial communication module designed for deployment within Yokogawa Field Control Station (FCS) platforms. It enables reliable communication using RS‑422 or RS‑485 interfaces, and supports functions such as Modbus slave and subsystem communications (e.g. sequencing systems), facilitating data exchange between the FCS and external subsystems or supervisory systems.
This dual‑port module provides both point‑to‑point (RS‑422) and multipoint (RS‑485) communication, with robust industrial-grade performance and seamless integration into Yokogawa’s control architecture.
Technical Specifications
| Item | Specification |
|---|---|
| 型号 | ALR121-S50 S1 |
| Module Type | Serial Communication Module |
| Communication Interfaces | RS-422 (point-to-point), RS-485 (multipoint) |
| Number / Ports | 2 |
| Communication Mode | Half-duplex |
| Synchronization | Start-stop synchronization |
| Baud Rates 支持ed | 1200 / 2400 / 4800 / 9600 / 19200 / 38400 bps |
| Character Format | 7 or 8 bits |
| Parity Options | None, Even, Odd |
| Stop Bits | 1 or 2 |
| Transmission Distance | RS-422: ~15 m, RS-485: ~1200 m |
| Communication Functions | Modbus Slave, Subsystem Communication |
| Redundancy | Dual-redundant supported |
| Mounting Compatibility | AFV30/40, A2FV50/70, ANB10/11 |
| Power Consumption | Approx. 0.5 A |
| Dimensions | 126.7 × 32.8 × 130 mm |
| 重量 | 0.3 kg |
Industry Applications
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Enables Modbus slave communication between Yokogawa FCS and external supervisory systems.
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Facilitates subsystem communications (e.g., sequencing or FA-M3 controllers).
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Used in safety control stations (SCS) for process safety applications (e.g., SSC50, SSC60 series).
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Ideal for industrial automation systems that require serial interfacing over long distances.
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支持s dual-redundant configurations for high-availability critical systems.
Key Advantages
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Versatile Serial Interfaces: 支持s both RS‑422 and RS‑485, with broad transmission speed options.
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Dual-Port Design: Two RS‑422/485 ports enable flexible configuration and redundancy.
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支持s Multiple Communication Modes: Compatible with Modbus slave and subsystem communication protocols.
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Long-Distance Capability: Up to 1200 m overall RS‑485 range, ideal for distributed systems.
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Redundancy 支持: Allows dual‑module redundancy for mission-critical installations.
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Compact and Lightweight: Weighs only ≈ 0.3 kg, easy for rack-mounted installation.
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Low Power Usage: Simple interface with low current draw (≤ 0.5 A).
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Seamless Integration: Designed for Yokogawa FCS/SCS platforms including AFV/A2FV/ANB 件s.
常见问题 (FAQ)
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What serial protocols does this module support?
支持s RS‑422 (point‑to‑point) and RS‑485 (multipoint), with Modbus or subsystem communication. -
What transmission speeds are supported?
Ranges from 1200 bps up to 38,400 bps (baud rates selectable per channel). -
What is the maximum communication distance?
RS‑422 supports up to ~15 m; RS‑485 supports up to ~1200 m total length. -
Can this module operate in redundant mode?
Yes, the ALR121 supports dual‑module redundancy for critical system reliability. -
How many ports are available on the module?
Two independent RS‑422/485 serial ports. -
What are the power and weight specifications?
Consumes 0.5 A (24 V DC), weight 0.3 kg. -
Which control stations does it support?
Compatible with AFV30/40, A2FV50/70 FCS and ANB10/11 nodes installation. -
What communication functions are available?
Includes Modbus slave communication and subsystem communication capabilities. -
What synchronization method is used?
Half‑duplex with start-stop synchronization; lag time ~1 ms after transmission. -
Which types / devices can it connect to?
Suitable for Modbus masters, FA-series PLCs, safety subsystems, sequencers, and similar devices.
Related 型号s
| 型号 Number | 描述 |
|---|---|
| ALR111‑S50 S1 | RS‑232C Serial Communication Module (single channel) |
| ALE111‑S51 | Ethernet Communication Module |
| ALD112‑S00 | DeviceNet Communication Module |
| ALF111‑S01 | Fieldbus H1 LAS Communication Module |
| ALR121‑S50 Dual | Dual‑redundant serial module configuration |
| ALR121‑E S1 | Explosion‑protected version / ALR121 |
Popular Yokogawa Modules
| 型号 Number | 描述 |
|---|---|
| CENTUM VP Controller | Yokogawa Distributed Control System CPU |
| AAV141‑S00 | S2 Analog Input Module |
| ADV561‑P00 | S2 Digital Output Module |
| ALE111‑S51‑S1 | Ethernet Communication Module |
| ALF111‑S01 | Foundation Fieldbus LAS Module |
| AAT141‑S03 | High-precision Analog Input Module |
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